Evan Anders

Thanks, @kburns ! Here's an alternate MWE in test form inside of test_spherical_ncc.py that Daniel and I came up with: [test_spherical_ncc.py.txt](https://github.com/DedalusProject/dedalus/files/9261738/test_spherical_ncc.py.txt) (see "test_identity_multiply")

As a temporary fix, I think raising an error and saying to make it an NCC works! That's a trivial difference to make to my script as a user, especially...

I think we're talking about two different processes when we talk about merging. Here, I'm talking about combining the data distributed across many files for a virtual file into one...

Hi Keaton, I didn't know about that method! I'll take a look and try to get that implemented. I've marked the PR as a draft for now.